Default Count-Based Network Models for Credit Contagion
Agosto, A. and Ahelegbey D.F. (2020) Default count-based network models for credit contagion, Journal of the Operational Research Society, DOI: 10.1080/01605682.2020.1776169
19 Pages Posted: 1 Apr 2020 Last revised: 27 Sep 2021
Date Written: January 28, 2020
Interconnectedness between economic institution and sectors, already recognised as a trigger of the great financial crisis in 2008-2009, is assuming growing importance in financial systems. In this paper we study contagion effects between corporate sectors using financial network models, in which the significant links are identified through conditional independence testing. While the existing financial network literature is mostly focused on Gaussian processes, our approach is based on discrete data. We indeed test dependence in the conditional mean (and volatility) of default counts in different economic sector estimated from Poisson autoregressive models, and in its shocks. Our empirical application to Italian corporate defaults in the 1996-2018 period reveals evidence of a high inter-sector vulnerability, especially at the onset of the global financial crisis in 2008 and in the following years. Many contagion effects between corporate sectors are indeed found in the shock component of the default count dynamics.
Keywords: Financial networks; Inter-sector contagion; Poisson autoregressive models; Vector autoregressive models; Conditional Granger causality; PC-algorithm
JEL Classification: C01, C32, C58, G21, G32
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